Also explore the Game Programming section on Amazon.com. There's a lot out there on strategic computation, game theory, random responses, etc.

There are many aspects for AI in strategy games, but keep in mind that there is a big difference between Realistic AI and AI that makes a game fun to play. Cheat where you can while not making it obvious to the player that the enemy is cheating.

Also gamedev.net has a huge collection on AI articles and a good forum with lots of information. (http://www.gamedev.net)

Game Programming Gems feature a section on AI as well, but when AI is what you want, go with the AI Game Programming Wisdom books.

Here is an overview on RTS specific articles: http://www.aiwisdom.com/ai_genrerts.html
Also look at Pathfinding, possibly some neural networks / genetic algorithms when you want to play with that, although it might be a bit overkill when you're just starting out.

I want to make a turn base strategy game. I was just curious if anyone had any sources or books that explains the concept and architect of designing a turn based strategy game or any turn based game. thanks!

There's a series of books with short articles on Game AI (1, 2, 3, 4). You might be able to find one or more at a local library too.